EvtAmplitude.hh

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/*******************************************************************************
 * Project: BaBar detector at the SLAC PEP-II B-factory
 * Package: EvtGenBase
 *    File: $Id: EvtAmplitude.hh,v 1.1.1.2 2007/10/26 05:03:14 pingrg Exp $
 *  Author: Alexei Dvoretskii, dvoretsk@slac.stanford.edu, 2001-2002
 *
 * Copyright (C) 2002 Caltech
 *******************************************************************************/
 
// Complex-valued amplitude
 
#ifndef EVT_AMPLITUDE_HH
#define EVT_AMPLITUDE_HH
 
#include "EvtComplex.hh"
 
template <class T> class EvtAmplitude {
public:
  EvtAmplitude() {}
  EvtAmplitude( const EvtAmplitude& ) {}
  virtual ~EvtAmplitude() {}
  virtual EvtAmplitude<T>* clone() const = 0;
 
  EvtComplex evaluate( const T& p ) const {
    EvtComplex ret( 0., 0. );
    if ( p.isValid() ) ret = amplitude( p );
    return ret;
  }
 
protected:
  // Derive in subclasses to define amplitude computation
  // for a fully constructed amplitude object.
 
  virtual EvtComplex amplitude( const T& ) const = 0;
};
 
#endif